2 * Copyright (c) 1987, 1991, 1993
3 * The Regents of the University of California.
4 * Copyright (c) 2005 Robert N. M. Watson
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * @(#)kern_malloc.c 8.3 (Berkeley) 1/4/94
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/systm.h>
43 #include <sys/kernel.h>
45 #include <sys/malloc.h>
47 #include <sys/mutex.h>
48 #include <sys/vmmeter.h>
51 #include <sys/sysctl.h>
56 #include <vm/vm_param.h>
57 #include <vm/vm_kern.h>
58 #include <vm/vm_extern.h>
59 #include <vm/vm_map.h>
60 #include <vm/vm_page.h>
62 #include <vm/uma_int.h>
63 #include <vm/uma_dbg.h>
66 #include <vm/memguard.h>
69 #include <vm/redzone.h>
72 #if defined(INVARIANTS) && defined(__i386__)
73 #include <machine/cpu.h>
79 * When realloc() is called, if the new size is sufficiently smaller than
80 * the old size, realloc() will allocate a new, smaller block to avoid
81 * wasting memory. 'Sufficiently smaller' is defined as: newsize <=
82 * oldsize / 2^n, where REALLOC_FRACTION defines the value of 'n'.
84 #ifndef REALLOC_FRACTION
85 #define REALLOC_FRACTION 1 /* new block if <= half the size */
88 MALLOC_DEFINE(M_CACHE, "cache", "Various Dynamically allocated caches");
89 MALLOC_DEFINE(M_DEVBUF, "devbuf", "device driver memory");
90 MALLOC_DEFINE(M_TEMP, "temp", "misc temporary data buffers");
92 MALLOC_DEFINE(M_IP6OPT, "ip6opt", "IPv6 options");
93 MALLOC_DEFINE(M_IP6NDP, "ip6ndp", "IPv6 Neighbor Discovery");
95 static void kmeminit(void *);
96 SYSINIT(kmem, SI_SUB_KMEM, SI_ORDER_FIRST, kmeminit, NULL)
98 static MALLOC_DEFINE(M_FREE, "free", "should be on free list");
100 static struct malloc_type *kmemstatistics;
101 static char *kmembase;
102 static char *kmemlimit;
103 static int kmemcount;
105 #define KMEM_ZSHIFT 4
106 #define KMEM_ZBASE 16
107 #define KMEM_ZMASK (KMEM_ZBASE - 1)
109 #define KMEM_ZMAX PAGE_SIZE
110 #define KMEM_ZSIZE (KMEM_ZMAX >> KMEM_ZSHIFT)
111 static u_int8_t kmemsize[KMEM_ZSIZE + 1];
113 /* These won't be powers of two for long */
125 {1024, "1024", NULL},
126 {2048, "2048", NULL},
127 {4096, "4096", NULL},
129 {8192, "8192", NULL},
131 {16384, "16384", NULL},
132 #if PAGE_SIZE > 16384
133 {32768, "32768", NULL},
134 #if PAGE_SIZE > 32768
135 {65536, "65536", NULL},
136 #if PAGE_SIZE > 65536
137 #error "Unsupported PAGE_SIZE"
146 static uma_zone_t mt_zone;
149 SYSCTL_UINT(_vm, OID_AUTO, kmem_size, CTLFLAG_RD, &vm_kmem_size, 0,
150 "Size of kernel memory");
152 u_int vm_kmem_size_max;
153 SYSCTL_UINT(_vm, OID_AUTO, kmem_size_max, CTLFLAG_RD, &vm_kmem_size_max, 0,
154 "Maximum size of kernel memory");
156 u_int vm_kmem_size_scale;
157 SYSCTL_UINT(_vm, OID_AUTO, kmem_size_scale, CTLFLAG_RD, &vm_kmem_size_scale, 0,
158 "Scale factor for kernel memory size");
161 * The malloc_mtx protects the kmemstatistics linked list.
164 struct mtx malloc_mtx;
166 #ifdef MALLOC_PROFILE
167 uint64_t krequests[KMEM_ZSIZE + 1];
169 static int sysctl_kern_mprof(SYSCTL_HANDLER_ARGS);
172 static int sysctl_kern_malloc(SYSCTL_HANDLER_ARGS);
173 static int sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS);
175 /* time_uptime of last malloc(9) failure */
176 static time_t t_malloc_fail;
178 #ifdef MALLOC_MAKE_FAILURES
180 * Causes malloc failures every (n) mallocs with M_NOWAIT. If set to 0,
181 * doesn't cause failures.
183 SYSCTL_NODE(_debug, OID_AUTO, malloc, CTLFLAG_RD, 0,
184 "Kernel malloc debugging options");
186 static int malloc_failure_rate;
187 static int malloc_nowait_count;
188 static int malloc_failure_count;
189 SYSCTL_INT(_debug_malloc, OID_AUTO, failure_rate, CTLFLAG_RW,
190 &malloc_failure_rate, 0, "Every (n) mallocs with M_NOWAIT will fail");
191 TUNABLE_INT("debug.malloc.failure_rate", &malloc_failure_rate);
192 SYSCTL_INT(_debug_malloc, OID_AUTO, failure_count, CTLFLAG_RD,
193 &malloc_failure_count, 0, "Number of imposed M_NOWAIT malloc failures");
197 malloc_last_fail(void)
200 return (time_uptime - t_malloc_fail);
204 * Add this to the informational malloc_type bucket.
207 malloc_type_zone_allocated(struct malloc_type *mtp, unsigned long size,
210 struct malloc_type_internal *mtip;
211 struct malloc_type_stats *mtsp;
214 mtip = mtp->ks_handle;
215 mtsp = &mtip->mti_stats[curcpu];
217 mtsp->mts_memalloced += size;
218 mtsp->mts_numallocs++;
221 mtsp->mts_size |= 1 << zindx;
226 malloc_type_allocated(struct malloc_type *mtp, unsigned long size)
230 malloc_type_zone_allocated(mtp, size, -1);
234 * Remove this allocation from the informational malloc_type bucket.
237 malloc_type_freed(struct malloc_type *mtp, unsigned long size)
239 struct malloc_type_internal *mtip;
240 struct malloc_type_stats *mtsp;
243 mtip = mtp->ks_handle;
244 mtsp = &mtip->mti_stats[curcpu];
245 mtsp->mts_memfreed += size;
246 mtsp->mts_numfrees++;
253 * Allocate a block of memory.
255 * If M_NOWAIT is set, this routine will not block and return NULL if
256 * the allocation fails.
259 malloc(unsigned long size, struct malloc_type *mtp, int flags)
265 #if defined(DIAGNOSTIC) || defined(DEBUG_REDZONE)
266 unsigned long osize = size;
271 * Check that exactly one of M_WAITOK or M_NOWAIT is specified.
273 indx = flags & (M_WAITOK | M_NOWAIT);
274 if (indx != M_NOWAIT && indx != M_WAITOK) {
275 static struct timeval lasterr;
276 static int curerr, once;
277 if (once == 0 && ppsratecheck(&lasterr, &curerr, 1)) {
278 printf("Bad malloc flags: %x\n", indx);
287 kdb_enter("zero size malloc");
289 #ifdef MALLOC_MAKE_FAILURES
290 if ((flags & M_NOWAIT) && (malloc_failure_rate != 0)) {
291 atomic_add_int(&malloc_nowait_count, 1);
292 if ((malloc_nowait_count % malloc_failure_rate) == 0) {
293 atomic_add_int(&malloc_failure_count, 1);
294 t_malloc_fail = time_uptime;
299 if (flags & M_WAITOK)
300 KASSERT(curthread->td_intr_nesting_level == 0,
301 ("malloc(M_WAITOK) in interrupt context"));
303 #ifdef DEBUG_MEMGUARD
304 if (memguard_cmp(mtp))
305 return memguard_alloc(size, flags);
309 size = redzone_size_ntor(size);
312 if (size <= KMEM_ZMAX) {
313 if (size & KMEM_ZMASK)
314 size = (size & ~KMEM_ZMASK) + KMEM_ZBASE;
315 indx = kmemsize[size >> KMEM_ZSHIFT];
316 zone = kmemzones[indx].kz_zone;
318 #ifdef MALLOC_PROFILE
319 krequests[size >> KMEM_ZSHIFT]++;
321 va = uma_zalloc(zone, flags);
324 malloc_type_zone_allocated(mtp, va == NULL ? 0 : size, indx);
326 size = roundup(size, PAGE_SIZE);
329 va = uma_large_malloc(size, flags);
330 malloc_type_allocated(mtp, va == NULL ? 0 : size);
332 if (flags & M_WAITOK)
333 KASSERT(va != NULL, ("malloc(M_WAITOK) returned NULL"));
335 t_malloc_fail = time_uptime;
337 if (va != NULL && !(flags & M_ZERO)) {
338 memset(va, 0x70, osize);
343 va = redzone_setup(va, osize);
345 return ((void *) va);
351 * Free a block of memory allocated by malloc.
353 * This routine may not block.
356 free(void *addr, struct malloc_type *mtp)
361 /* free(NULL, ...) does nothing */
365 #ifdef DEBUG_MEMGUARD
366 if (memguard_cmp(mtp)) {
374 addr = redzone_addr_ntor(addr);
379 slab = vtoslab((vm_offset_t)addr & (~UMA_SLAB_MASK));
382 panic("free: address %p(%p) has not been allocated.\n",
383 addr, (void *)((u_long)addr & (~UMA_SLAB_MASK)));
386 if (!(slab->us_flags & UMA_SLAB_MALLOC)) {
388 struct malloc_type **mtpp = addr;
390 size = slab->us_keg->uk_size;
393 * Cache a pointer to the malloc_type that most recently freed
394 * this memory here. This way we know who is most likely to
395 * have stepped on it later.
397 * This code assumes that size is a multiple of 8 bytes for
400 mtpp = (struct malloc_type **)
401 ((unsigned long)mtpp & ~UMA_ALIGN_PTR);
402 mtpp += (size - sizeof(struct malloc_type *)) /
403 sizeof(struct malloc_type *);
406 uma_zfree_arg(LIST_FIRST(&slab->us_keg->uk_zones), addr, slab);
408 size = slab->us_size;
409 uma_large_free(slab);
411 malloc_type_freed(mtp, size);
415 * realloc: change the size of a memory block
418 realloc(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
424 /* realloc(NULL, ...) is equivalent to malloc(...) */
426 return (malloc(size, mtp, flags));
429 * XXX: Should report free of old memory and alloc of new memory to
433 #ifdef DEBUG_MEMGUARD
434 if (memguard_cmp(mtp)) {
442 alloc = redzone_get_size(addr);
444 slab = vtoslab((vm_offset_t)addr & ~(UMA_SLAB_MASK));
447 KASSERT(slab != NULL,
448 ("realloc: address %p out of range", (void *)addr));
450 /* Get the size of the original block */
451 if (!(slab->us_flags & UMA_SLAB_MALLOC))
452 alloc = slab->us_keg->uk_size;
454 alloc = slab->us_size;
456 /* Reuse the original block if appropriate */
458 && (size > (alloc >> REALLOC_FRACTION) || alloc == MINALLOCSIZE))
460 #endif /* !DEBUG_REDZONE */
462 #ifdef DEBUG_MEMGUARD
466 /* Allocate a new, bigger (or smaller) block */
467 if ((newaddr = malloc(size, mtp, flags)) == NULL)
470 /* Copy over original contents */
471 bcopy(addr, newaddr, min(size, alloc));
477 * reallocf: same as realloc() but free memory on failure.
480 reallocf(void *addr, unsigned long size, struct malloc_type *mtp, int flags)
484 if ((mem = realloc(addr, size, mtp, flags)) == NULL)
490 * Initialize the kernel memory allocator
494 kmeminit(void *dummy)
500 mtx_init(&malloc_mtx, "malloc", NULL, MTX_DEF);
503 * Try to auto-tune the kernel memory size, so that it is
504 * more applicable for a wider range of machine sizes.
505 * On an X86, a VM_KMEM_SIZE_SCALE value of 4 is good, while
506 * a VM_KMEM_SIZE of 12MB is a fair compromise. The
507 * VM_KMEM_SIZE_MAX is dependent on the maximum KVA space
508 * available, and on an X86 with a total KVA space of 256MB,
509 * try to keep VM_KMEM_SIZE_MAX at 80MB or below.
511 * Note that the kmem_map is also used by the zone allocator,
512 * so make sure that there is enough space.
514 vm_kmem_size = VM_KMEM_SIZE + nmbclusters * PAGE_SIZE;
515 mem_size = cnt.v_page_count;
517 #if defined(VM_KMEM_SIZE_SCALE)
518 vm_kmem_size_scale = VM_KMEM_SIZE_SCALE;
520 TUNABLE_INT_FETCH("vm.kmem_size_scale", &vm_kmem_size_scale);
521 if (vm_kmem_size_scale > 0 &&
522 (mem_size / vm_kmem_size_scale) > (vm_kmem_size / PAGE_SIZE))
523 vm_kmem_size = (mem_size / vm_kmem_size_scale) * PAGE_SIZE;
525 #if defined(VM_KMEM_SIZE_MAX)
526 vm_kmem_size_max = VM_KMEM_SIZE_MAX;
528 TUNABLE_INT_FETCH("vm.kmem_size_max", &vm_kmem_size_max);
529 if (vm_kmem_size_max > 0 && vm_kmem_size >= vm_kmem_size_max)
530 vm_kmem_size = vm_kmem_size_max;
532 /* Allow final override from the kernel environment */
534 if (TUNABLE_INT_FETCH("kern.vm.kmem.size", &vm_kmem_size) != 0)
535 printf("kern.vm.kmem.size is now called vm.kmem_size!\n");
537 TUNABLE_INT_FETCH("vm.kmem_size", &vm_kmem_size);
540 * Limit kmem virtual size to twice the physical memory.
541 * This allows for kmem map sparseness, but limits the size
542 * to something sane. Be careful to not overflow the 32bit
543 * ints while doing the check.
545 if (((vm_kmem_size / 2) / PAGE_SIZE) > cnt.v_page_count)
546 vm_kmem_size = 2 * cnt.v_page_count * PAGE_SIZE;
549 * Tune settings based on the kernel map's size at this time.
551 init_param3(vm_kmem_size / PAGE_SIZE);
553 kmem_map = kmem_suballoc(kernel_map, (vm_offset_t *)&kmembase,
554 (vm_offset_t *)&kmemlimit, vm_kmem_size);
555 kmem_map->system_map = 1;
557 #ifdef DEBUG_MEMGUARD
559 * Initialize MemGuard if support compiled in. MemGuard is a
560 * replacement allocator used for detecting tamper-after-free
561 * scenarios as they occur. It is only used for debugging.
563 vm_memguard_divisor = 10;
564 TUNABLE_INT_FETCH("vm.memguard.divisor", &vm_memguard_divisor);
566 /* Pick a conservative value if provided value sucks. */
567 if ((vm_memguard_divisor <= 0) ||
568 ((vm_kmem_size / vm_memguard_divisor) == 0))
569 vm_memguard_divisor = 10;
570 memguard_init(kmem_map, vm_kmem_size / vm_memguard_divisor);
575 mt_zone = uma_zcreate("mt_zone", sizeof(struct malloc_type_internal),
577 mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
579 NULL, NULL, NULL, NULL,
581 UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
582 for (i = 0, indx = 0; kmemzones[indx].kz_size != 0; indx++) {
583 int size = kmemzones[indx].kz_size;
584 char *name = kmemzones[indx].kz_name;
586 kmemzones[indx].kz_zone = uma_zcreate(name, size,
588 mtrash_ctor, mtrash_dtor, mtrash_init, mtrash_fini,
590 NULL, NULL, NULL, NULL,
592 UMA_ALIGN_PTR, UMA_ZONE_MALLOC);
594 for (;i <= size; i+= KMEM_ZBASE)
595 kmemsize[i >> KMEM_ZSHIFT] = indx;
601 malloc_init(void *data)
603 struct malloc_type_internal *mtip;
604 struct malloc_type *mtp;
606 KASSERT(cnt.v_page_count != 0, ("malloc_register before vm_init"));
609 mtip = uma_zalloc(mt_zone, M_WAITOK | M_ZERO);
610 mtp->ks_handle = mtip;
612 mtx_lock(&malloc_mtx);
613 mtp->ks_next = kmemstatistics;
614 kmemstatistics = mtp;
616 mtx_unlock(&malloc_mtx);
620 malloc_uninit(void *data)
622 struct malloc_type_internal *mtip;
623 struct malloc_type_stats *mtsp;
624 struct malloc_type *mtp, *temp;
625 long temp_allocs, temp_bytes;
629 KASSERT(mtp->ks_handle != NULL, ("malloc_deregister: cookie NULL"));
630 mtx_lock(&malloc_mtx);
631 mtip = mtp->ks_handle;
632 mtp->ks_handle = NULL;
633 if (mtp != kmemstatistics) {
634 for (temp = kmemstatistics; temp != NULL;
635 temp = temp->ks_next) {
636 if (temp->ks_next == mtp)
637 temp->ks_next = mtp->ks_next;
640 kmemstatistics = mtp->ks_next;
642 mtx_unlock(&malloc_mtx);
645 * Look for memory leaks.
647 temp_allocs = temp_bytes = 0;
648 for (i = 0; i < MAXCPU; i++) {
649 mtsp = &mtip->mti_stats[i];
650 temp_allocs += mtsp->mts_numallocs;
651 temp_allocs -= mtsp->mts_numfrees;
652 temp_bytes += mtsp->mts_memalloced;
653 temp_bytes -= mtsp->mts_memfreed;
655 if (temp_allocs > 0 || temp_bytes > 0) {
656 printf("Warning: memory type %s leaked memory on destroy "
657 "(%ld allocations, %ld bytes leaked).\n", mtp->ks_shortdesc,
658 temp_allocs, temp_bytes);
661 uma_zfree(mt_zone, mtip);
665 malloc_desc2type(const char *desc)
667 struct malloc_type *mtp;
669 mtx_assert(&malloc_mtx, MA_OWNED);
670 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
671 if (strcmp(mtp->ks_shortdesc, desc) == 0)
678 sysctl_kern_malloc(SYSCTL_HANDLER_ARGS)
680 struct malloc_type_stats mts_local, *mtsp;
681 struct malloc_type_internal *mtip;
682 struct malloc_type *mtp;
684 long temp_allocs, temp_bytes;
695 /* Guess at how much room is needed. */
696 mtx_lock(&malloc_mtx);
698 mtx_unlock(&malloc_mtx);
700 bufsize = linesize * (cnt + 1);
701 buf = malloc(bufsize, M_TEMP, M_WAITOK|M_ZERO);
702 sbuf_new(&sbuf, buf, bufsize, SBUF_FIXEDLEN);
704 mtx_lock(&malloc_mtx);
706 "\n Type InUse MemUse HighUse Requests Size(s)\n");
707 for (mtp = kmemstatistics; cnt != 0 && mtp != NULL;
708 mtp = mtp->ks_next, cnt--) {
709 mtip = mtp->ks_handle;
710 bzero(&mts_local, sizeof(mts_local));
711 for (i = 0; i < MAXCPU; i++) {
712 mtsp = &mtip->mti_stats[i];
713 mts_local.mts_memalloced += mtsp->mts_memalloced;
714 mts_local.mts_memfreed += mtsp->mts_memfreed;
715 mts_local.mts_numallocs += mtsp->mts_numallocs;
716 mts_local.mts_numfrees += mtsp->mts_numfrees;
717 mts_local.mts_size |= mtsp->mts_size;
719 if (mts_local.mts_numallocs == 0)
723 * Due to races in per-CPU statistics gather, it's possible to
724 * get a slightly negative number here. If we do, approximate
727 if (mts_local.mts_numallocs > mts_local.mts_numfrees)
728 temp_allocs = mts_local.mts_numallocs -
729 mts_local.mts_numfrees;
734 * Ditto for bytes allocated.
736 if (mts_local.mts_memalloced > mts_local.mts_memfreed)
737 temp_bytes = mts_local.mts_memalloced -
738 mts_local.mts_memfreed;
743 * High-waterwark is no longer easily available, so we just
744 * print '-' for that column.
746 sbuf_printf(&sbuf, "%13s%6lu%6luK -%9llu",
749 (temp_bytes + 1023) / 1024,
750 (unsigned long long)mts_local.mts_numallocs);
753 for (i = 0; i < sizeof(kmemzones) / sizeof(kmemzones[0]) - 1;
755 if (mts_local.mts_size & (1 << i)) {
757 sbuf_printf(&sbuf, " ");
759 sbuf_printf(&sbuf, ",");
760 sbuf_printf(&sbuf, "%s",
761 kmemzones[i].kz_name);
765 sbuf_printf(&sbuf, "\n");
768 mtx_unlock(&malloc_mtx);
770 error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
777 SYSCTL_OID(_kern, OID_AUTO, malloc, CTLTYPE_STRING|CTLFLAG_RD,
778 NULL, 0, sysctl_kern_malloc, "A", "Malloc Stats");
781 sysctl_kern_malloc_stats(SYSCTL_HANDLER_ARGS)
783 struct malloc_type_stream_header mtsh;
784 struct malloc_type_internal *mtip;
785 struct malloc_type_header mth;
786 struct malloc_type *mtp;
787 int buflen, count, error, i;
791 mtx_lock(&malloc_mtx);
793 mtx_assert(&malloc_mtx, MA_OWNED);
795 mtx_unlock(&malloc_mtx);
796 buflen = sizeof(mtsh) + count * (sizeof(mth) +
797 sizeof(struct malloc_type_stats) * MAXCPU) + 1;
798 buffer = malloc(buflen, M_TEMP, M_WAITOK | M_ZERO);
799 mtx_lock(&malloc_mtx);
800 if (count < kmemcount) {
801 free(buffer, M_TEMP);
805 sbuf_new(&sbuf, buffer, buflen, SBUF_FIXEDLEN);
808 * Insert stream header.
810 bzero(&mtsh, sizeof(mtsh));
811 mtsh.mtsh_version = MALLOC_TYPE_STREAM_VERSION;
812 mtsh.mtsh_maxcpus = MAXCPU;
813 mtsh.mtsh_count = kmemcount;
814 if (sbuf_bcat(&sbuf, &mtsh, sizeof(mtsh)) < 0) {
815 mtx_unlock(&malloc_mtx);
821 * Insert alternating sequence of type headers and type statistics.
823 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
824 mtip = (struct malloc_type_internal *)mtp->ks_handle;
827 * Insert type header.
829 bzero(&mth, sizeof(mth));
830 strlcpy(mth.mth_name, mtp->ks_shortdesc, MALLOC_MAX_NAME);
831 if (sbuf_bcat(&sbuf, &mth, sizeof(mth)) < 0) {
832 mtx_unlock(&malloc_mtx);
838 * Insert type statistics for each CPU.
840 for (i = 0; i < MAXCPU; i++) {
841 if (sbuf_bcat(&sbuf, &mtip->mti_stats[i],
842 sizeof(mtip->mti_stats[i])) < 0) {
843 mtx_unlock(&malloc_mtx);
849 mtx_unlock(&malloc_mtx);
851 error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
854 free(buffer, M_TEMP);
858 SYSCTL_PROC(_kern, OID_AUTO, malloc_stats, CTLFLAG_RD|CTLTYPE_STRUCT,
859 0, 0, sysctl_kern_malloc_stats, "s,malloc_type_ustats",
860 "Return malloc types");
862 SYSCTL_INT(_kern, OID_AUTO, malloc_count, CTLFLAG_RD, &kmemcount, 0,
863 "Count of kernel malloc types");
866 DB_SHOW_COMMAND(malloc, db_show_malloc)
868 struct malloc_type_internal *mtip;
869 struct malloc_type *mtp;
870 u_int64_t allocs, frees;
873 db_printf("%18s %12s %12s %12s\n", "Type", "Allocs", "Frees",
875 for (mtp = kmemstatistics; mtp != NULL; mtp = mtp->ks_next) {
876 mtip = (struct malloc_type_internal *)mtp->ks_handle;
879 for (i = 0; i < MAXCPU; i++) {
880 allocs += mtip->mti_stats[i].mts_numallocs;
881 frees += mtip->mti_stats[i].mts_numfrees;
883 db_printf("%18s %12ju %12ju %12ju\n", mtp->ks_shortdesc,
884 allocs, frees, allocs - frees);
889 #ifdef MALLOC_PROFILE
892 sysctl_kern_mprof(SYSCTL_HANDLER_ARGS)
906 bufsize = linesize * (KMEM_ZSIZE + 1);
907 bufsize += 128; /* For the stats line */
908 bufsize += 128; /* For the banner line */
912 buf = malloc(bufsize, M_TEMP, M_WAITOK|M_ZERO);
913 sbuf_new(&sbuf, buf, bufsize, SBUF_FIXEDLEN);
915 "\n Size Requests Real Size\n");
916 for (i = 0; i < KMEM_ZSIZE; i++) {
917 size = i << KMEM_ZSHIFT;
918 rsize = kmemzones[kmemsize[i]].kz_size;
919 count = (long long unsigned)krequests[i];
921 sbuf_printf(&sbuf, "%6d%28llu%11d\n", size,
922 (unsigned long long)count, rsize);
924 if ((rsize * count) > (size * count))
925 waste += (rsize * count) - (size * count);
926 mem += (rsize * count);
929 "\nTotal memory used:\t%30llu\nTotal Memory wasted:\t%30llu\n",
930 (unsigned long long)mem, (unsigned long long)waste);
933 error = SYSCTL_OUT(req, sbuf_data(&sbuf), sbuf_len(&sbuf));
940 SYSCTL_OID(_kern, OID_AUTO, mprof, CTLTYPE_STRING|CTLFLAG_RD,
941 NULL, 0, sysctl_kern_mprof, "A", "Malloc Profiling");
942 #endif /* MALLOC_PROFILE */